Date: Mon, 5 Sep 2016 23:34:12 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Alan Somers <asomers@freebsd.org> Cc: Jim Ohlstein <jim@ohlste.in>, FreeBSD Stable ML <freebsd-stable@freebsd.org> Subject: Re: AIO not working on NFS share - ? Regression Message-ID: <20160905203412.GQ83214@kib.kiev.ua> In-Reply-To: <CAOtMX2iWaYq9ujgZ3bWx3YYo5ESgz5hp6epo=rbro7yDU2QESQ@mail.gmail.com> References: <6c9093cd-1323-77b1-b27e-f53b58ec86e4@ohlste.in> <CAOtMX2iWaYq9ujgZ3bWx3YYo5ESgz5hp6epo=rbro7yDU2QESQ@mail.gmail.com>
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On Mon, Sep 05, 2016 at 02:26:30PM -0600, Alan Somers wrote:
> Just to get your webserver out of the picture, could you please try
> running the aio test suite on an NFS share? Do it like this:
> $ cd /usr/tests/sys/aio
> $ export TMPFS=/path/to/some/nfs/share
> $ kyua test
By default, unsafe aio is disabled, i.e. aio where the operation is not
really async and can usurp kernel thread for indefinite amount of time.
Non-local filesystems accesses are classified as unsafe, since their
completion is controlled by remote host.
>
> -Alan
>
> On Mon, Sep 5, 2016 at 2:14 PM, Jim Ohlstein <jim@ohlste.in> wrote:
> > Hello,
> >
> > For sometime now we've used a backend (non-internet accessible) server to
> > generate static content that is shared via NFS to a front-end server for
> > internet access. Both machines use ZFS exclusively.
> >
> > The webserver is nginx and we had AIO set to on, with the AIO module built
> > into the kernel.In 10.x it "just worked".
> >
> > About two weeks ago I upgraded that backend machine to 11-STABLE in order to
> > start building packages for 11. I've just updated it again to r305417. I
> > don't recall it not working as expected.
> >
> > More recently I upgraded the front-end machine to 11-STABLE @r305311. Since
> > then, AIO is not working and I get a critical error in the nginx logs like
> > this:
> >
> > 2016/09/05 15:58:02 [crit] 21145#0: *649 aio_read("/path/to/file") failed
> > (45: Operation not supported) while sending response to client ...
> >
> > In 11 AIO is built into the kernel by default, and I have confirmed that it
> > works as expected in files from a local file system. Since the webserver
> > isn't aware that the file system in question is shared via NFS, it seems
> > this is an operating system issue.
> >
> > --
> > Jim Ohlstein
> > _______________________________________________
> > freebsd-stable@freebsd.org mailing list
> > https://lists.freebsd.org/mailman/listinfo/freebsd-stable
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